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--=====================_51786285==_.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed At 08:21 PM 7/25/99 , john.r.strohm@BI*.co* wrote: >George is absolutely correct when he says that blue light penetrates water >more effectively than red light. The Navy was doing some experimenting a >while back using lasers to communicate with submerged submarines: they used >blue-green argon lasers for precisely that reason. Agreed. Thought an HID bulb only burns about 1000 degrees Kelvin cooler than a Quartz-Tungsten. That's cooler but not that much more on the blue side. It's still not as blue as daylight. I still contend that the fact that the HID burns so much more efficiently for it's size is what makes it desireable. To have an 18 watt bulb that puts out the same amount of light as a 100 watt quartz bulb while at the same time drawing less than 2 Ah is why it sounds like a good thing. Not so much the color temp. It burns at around 4000 degrees Kelvin. If it was something like 10,000 degrees Kelvin then the "high frequency light" thing would be more believable ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mark Melendez melendez at bigfoot dot com http://www.bigfoot.com/~melendez --=====================_51786285==_.ALT Content-Type: text/html; charset="us-ascii" <html> <font size=3>At 08:21 PM 7/25/99 , john.r.strohm@BI*.co* wrote:<br> <blockquote type=cite cite>George is absolutely correct when he says that blue light penetrates water<br> more effectively than red light. The Navy was doing some experimenting a<br> while back using lasers to communicate with submerged submarines: they used<br> blue-green argon lasers for precisely that reason.</blockquote><br> Agreed. Thought an HID bulb only burns about 1000 degrees Kelvin cooler than a Quartz-Tungsten. That's cooler but not that much more on the blue side. It's still not as blue as daylight. I still contend that the fact that the HID burns so much more efficiently for it's size is what makes it desireable. To have an 18 watt bulb that puts out the same amount of light as a 100 watt quartz bulb while at the same time drawing less than 2 Ah is why it sounds like a good thing. Not so much the color temp. It burns at around 4000 degrees Kelvin. If it was something like 10,000 degrees Kelvin then the "high frequency light" thing would be more believable </font><br> <div>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</div> <div>Mark Melendez</div> <div>melendez at bigfoot dot com</div> <div><a href="http://www.bigfoot.com/~melendez" EUDORA=AUTOURL>http://www.bigfoot.com/~melendez</a></div> <br> <br> </html> --=====================_51786285==_.ALT-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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